Malicious PDF — malware analysis report

Static analysis result for SHA-256 e043092eafe84a3b…

MALICIOUS

PDF

75.2 KB Created: 2020-11-17 04:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 32ec79be92a235cc72af930dc0dee052 SHA-1: 3abc1ed03ce7188c26065ce8c3d49cf0de2f5c62 SHA-256: e043092eafe84a3bf6dd38e77a26799d5fa682c75427da81212dc98603ec218f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?utm_term=dragon+warrior+decks+hearthstone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5fb304355aae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f9718337b65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fb27de498c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fad373f137a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fa7f6757e006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_5f9e7118ca0a0.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/72bcabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_5faec368c2918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5fa9b7cbe1c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_5fa9e4806af74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fd10fb-6b12-4161-85d5-af0d09418fa3/contrato_de_alquiler_de_habitacion_por_temporada.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 5324 bytes
SHA-256: 82d4ee3fbb4fcd0c58fcfd55d83bbc4028edd7b937e9a8ec1e2eca7916100f06
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 11088 bytes
SHA-256: f22e37bd246298756ad1c7d776d87f74101695b7245fd5f4736490a600aa123d

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